What are the working principles and characteristics of the Screw Oil Press Machine?
(1) The working principle of the Screw Oil Press Machine. The general process of extracting oil can be summarized as the propulsion of the rotating screw shaft in the press chamber, which reduces the volume of the press chamber and produces continuous squeezing effect on the material. .
The basic process of squeezing oil is generally divided into three stages: feed pre-compression (low pressure) section; main squeezing (high pressure oil output) section; cake and drain (stabilization) section.
(2) The formation of press chamber pressure includes: ①The reduction of the empty volume of the press chamber forces the press material to be compressed to form pressure. The law of change that he shrinks along the axial direction reflects the law of change of pressure to a certain extent; ②The gap between the cake ring is reduced, and the reaction force to the pressing is increased.
(3) Distribution of press chamber pressure
① Vacant volume V is approximately the volume of the enclosed space between the outer surface of each lead of the screw shaft and the inner surface of the cage, called the "vacant volume" of the lead (single-thread pitch), which is calculated through geometric calculations. Got.
② Compression ratio is also called "vacant volume ratio", there is the ratio of the vacant volume corresponding to the two adjacent leads of the screw shaft, that is, E1-2=V1/V2; the total compression ratio E is also called "oil press or press chamber compression" Ratio" is the ratio of the empty volume of one lead at the feeding end of the system to the empty volume corresponding to one lead at the cake-out end, namely E=Vj/Vch. Its value is required to be greater than the actual compression ratio En of the squeezed material, and each lead should be so,
(4) The characteristics of the screw oil pressing mechanism oil is a continuous oil pressing equipment that uses a screw shaft to rotate and push the billet in the press cage while extruding into a cake and extruding grease. Compared with the "hydraulic press", the characteristics are: continuous production, large processing capacity of a single machine; can adapt to a variety of oils; dynamic squeezing, friction heating, short squeezing time, high oil yield; thin cakes are easy to crush; low operating intensity . Disadvantages are relatively large energy consumption; many consumable parts, high mechanical failure maintenance requirements; greater thermal influence of oil cakes, etc.
